add support to load ilastik h5 flavors

[k-dominik]

mostly because I'm annoyed i can not volumina my-result-file.h5/exported_data for quick viewing.

# specify everything
volumina /path/to/myfile.h5/internal/path --axistags zyxc

# if dataset has .dims or .attrs["axistags"] (vigra):
volumina /path/to/myfile.h5/internal/path

# if there's only a single dataset
volumina /path/to/myfile.h5

[codecov]

Codecov Report

Patch has no changes to coverable lines.

Files Changed	Coverage
volumina/__main__.py	0.00%

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[emilmelnikov]

This will print a message to stderr and exit with code 1.

sys.exit(f"Axistags required ...")